Electricity: motive power systems – Synchronous motor systems – Hysteresis or reluctance motor systems
Patent
1994-09-29
1996-02-20
Shoop, Jr., William M.
Electricity: motive power systems
Synchronous motor systems
Hysteresis or reluctance motor systems
318204, 318138, 318439, H02P 146
Patent
active
054931959
ABSTRACT:
An electric power generating system comprises a switched reluctance machine, an inverter having a dc input/output coupled to a dc bus, switches responsive to switching control signals for coupling each of the machine's phase windings to the dc bus, and diodes for cross-coupling each of the phase windings to the dc bus. A controller having a number of control inputs and outputs coupled to the inverter monitors the current flowing in the phase windings and the voltage level on the dc bus, and calculates a maximum and a minimum phase current control signal. The controller modulates the switching control signals to regulate the phase current within a range defined by these control signals to maintain the voltage level at a desired level. Upon calculating a positive phase current control signal, the controller generates switching control signals to enable switches at a fixed angle prior to alignment, and generates switching control signals to disable the switches at a fixed angle after alignment. In this way, the machine generates sufficient electric power to maintain the voltage level at the desired level. Upon calculating a negative phase current control signal, the controller generates switching control signals to enable the switches at a fixed angle prior to alignment, and generates switching control signals to disable one switch at a fixed angle prior to alignment. In this way, the machine dissipates sufficient electric power to maintain the voltage at the desired level.
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Ferreira Caio A.
Heglund William S.
Makeever Jeffery J.
Masih Karen
Shoop Jr. William M.
Sundstrand Corporation
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